It's important to keep up to date with developments in the wider field so your knowledge and skills are current and informed. Look for reliable sources of information online like notable organisations, charities or professional bodies. You can even sign up for bulletins, news feeds and automatic updates from some of them too.
City students may be able to access NHS libraries, either through the University of London membership scheme, whilst on placement, or if you work for a relevant trust. Check each service or organisation's website for details on access requirements and membership options.